Leben is a type of milk product that is made by adding special bacteria to fresh milk. These bacteria help to ferment the milk, which means they change it a little bit.
When the bacteria eat the natural sugars in the milk, they produce lactic acid. This acid makes the milk thicker and a little sour. That's why leben tastes sort of like yogurt, but with a different texture.
Leben is really good for you because it has lots of good bacteria in it that help your tummy feel happy and healthy. You can eat it by itself, mix it with fruit or honey, or even use it in cooking. Yum!